7693637981 has 2 divisors, whose sum is σ = 7693637982. Its totient is φ = 7693637980.

The previous prime is 7693637971. The next prime is 7693638041. The reversal of 7693637981 is 1897363967.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4516512025 + 3177125956 = 67205^2 + 56366^2 .

It is an emirp because it is prime and its reverse (1897363967) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7693637981 - 2¹⁰ = 7693636957 is a prime.

It is a super-2 number, since 2×7693637981² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7693637981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7693637921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3846818990 + 3846818991.

It is an arithmetic number, because the mean of its divisors is an integer number (3846818991).

Almost surely, 2^7693637981 is an apocalyptic number.

It is an amenable number.

7693637981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7693637981 is an equidigital number, since it uses as much as digits as its factorization.

7693637981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10287648, while the sum is 59.

The square root of 7693637981 is about 87713.3854152261. The cubic root of 7693637981 is about 1974.1368214120.

The spelling of 7693637981 in words is "seven billion, six hundred ninety-three million, six hundred thirty-seven thousand, nine hundred eighty-one".